Self-measuring oil-pump.



PATENTEDAUQQL 1906. J. B. DAVIS.

SELF MEASURING OIL PUMP.

APPLICATION FILED NOV. 10, 1905.

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No. 829,001. PATENTED AUGLZI, 1906. J. B. DAVIS.

SELF MEASURING OIL PUMP.

APPLICATION FILED NOV. 10, 1905.

BSIONIZ 45 illustrating 'JOHNB. DA'VI'S, OFDAYTON, oHio.

sELF-mE'AsuFime OIL-PUMP.

Specification of Letters Intent.

Patented Aug. 21, 1906.

Application filed November 10, 1965. Serial No- 286,665.

To all whom, it may concern.-

Be it known that I, JOHN B. DAVIS, acitizen of the United States,residing'at Dayton,

in thecounty of Montgomery and State of 5 Ohio, have invented certainnew and useful Im rovements in Self-Measuring Oil-Pumps; an I do declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to I o which itapoertains tomake and use the same,

reference being had to the acompanying drawings," and to the figures ofreference marked thereon, which form a part of this specification.

improvements inmeasuring oil-pum s and possesses the new andusefulfeatures ereinafter described and claimed.

The resent improvements relate to means in greater quantities than asingle gallon, to means for locking-the pump against opera- 25 tion byunauthorized persons, to means for preventing evaporation of gasolenewhen such is used in the'pump-cylinders, to means involving theconstruction of the pistons, and

to other features hereinafter described and 3 claimed.

Preceding a detail description of the inven-- tion reference is made tothe accompanying drawings, of which-- Figure 1 is an elevation of anoil-measuring 3 pump constructed'in accordance with my in.-

vention, a portion of one of the pump-cyhnders being roken away. Fig. 2is an elevation at right angles to Fig. 1. Fig. 3 is an enlargedsectional view of the discharge-spout.

. 40 Fig. 4 is an enlarged sectional view of one of the pistons andsurrounding portion of one of the cylinders. the upper portion of thepump. Fig. cross-sectional view on the line y 'y of Fig 1, the(price-scale and easing. ig.

7 an e arge detail view of a portion of one of the racks. Fig. 8 is anelevation of the price-scale removed from its cylinder. Fig. 9 is adetailuview illustrating the lock '50 mechanism. Fig. 10 is a detailview ofthe key for saidlock mechanism. v

In a detail description of the invention 7 similar reference charactersindicate corresponding parts.

This invention relates to new and useful nection with the piston, and

Fig- 5 is a detail view of" (Sis a' 1 1 designate a pair of uniformpump-cylin ders united to a base 3 above-a valve-casing 4, whichcontains four valves, one operating in connection with each cylinder, asshown in 2 designates a piston in each cylinder, for the s ecialconstruction of which see Fig. 4, whic discloses the following featuresurrounding the body myformer patents, Nos. 790,786 and 790,787.

hese springs when so placed around the body of the pistons exert anexpanding effect to ress outwardly in a uniform manner a pac 'ng ring orcup 24, which projects around the outer sides of the springs and liesadjacent to the inner surface of the cylinder. Maintaining saidpacking-cup in rigid conistons is a disk is held rigi y against thepacking by means of a jam-nut 26. The piston-rod 10 passes through asleeve 27, which is screwed through the disk and into the bod of thearound this sleeve 27 t e jamnut 26 is placed, Each {of the piston-rodshas a head 28, which lies in a recess in the piston, tion by the s eeve27. There is a suitable space between the piston-rod head 28 andt episton 2, the piston-rod and the sleeve 27, also between the piston 2,the disk 25, and the interior of the cy der, as illustrated in Fig. 4.By providing the constant and uniform pressure against the packing 24 bymeans of the springs, and which is augmented by the pressure of the oilentering the s ace in which said springs are located, the o' is reventedat all times from passin above t episton.

of 'the piston is a coilapring 23-, the ends of which are united. f

and said iston-rod is held in such pos1-- disk 25. This It-will beunderstood t at in the u ward movement of each iston the oil is awn intothe cylinder, an in the reverse or downward movement the oil is expelledinto the discharge-pipe 6, which will be hereinafter again referred toin connection with the discharge;nozzle22. (Shown inFig. 3.) Eachof thepiston-rods has attached to it a rack 11 an intervening head 12, substanformer patent. Eninion 13-on a shaft 14 (See Fig. 5.)

-crank 15, said racks the upper porother cylinder.

Means are provided for preventing a meddling with or useless operationof the pump by unauthorized persons and consisting of means illustratedin Figs. 5 and 9 of the drawings. These means consist of a screwplug 18,whichis screwed into a nipple 17 in a housing 16, which incloses theupper portion of the pinion 13. The screwplug 18 has a square head 21,which. is engaged by a key 19, which has a square opening 20 in its end,which receives the head of said screw. The screw may thus be insertedbetween the teeth of the pinion 13 and made to lock said pinion againstany movement. The discharge-pipe 6 has a specially-constructeddischarge-nozzle 22 attached thereto,which prevents any evaporation ofgasolene from the pump-cylinders when the pump is used for dispensingthat article. This nozzle is illustrated in Fig. 3 and consists of abody portion which. is screwed onto the end of the pipe. A gravty-valve29 seats above the inlet-chamber in said nozzle and is only opened bythe pressure of the oil when the same is being forced through the nozzleand out of the discharge end 23.

vents any outlet through the nozzle. A convenient means is provided onsaid nozzle for suspending a vessel into which the oil is dis' which hasa longitudinal sight-opening 33, through which the price-figures on thescale may be seen. The price-scale 31 is placed around the cylinder 30and consists of a sheet of pliable material, on the upper end of whichis a horizontal column of figures 34, which represent the prices pergallon. ,The lower figures under each price-per-gallon figure representthe prices. of fractional portions of a gallon at said price. Forexample, each vertical column is divided into spaces, which representfractional quantities of a gallonof and the figures represent the moneyvalues of said quantities. For example, the lefthand column, looking atFig. 8, contains eight spaces, which stand for eight parts of a gale lonat eight centsper gallon. Reading down- When the pump is not inoperation, the valve 29 seats itself and pre wardly in said column, aneighth of a gallon I Reading upwardly, the fig-' obtained. The figuresare preferably made to appear in contrasting colors. For example, theupper figures may be black and the lower figures red or white or otherc'ontrasting color. This cylindrical price-scale is rotated by the handby means of a finger-piece 35, which is connected thereto and lies abovethe top of the casing 32. (See Fig. 1.) These scale indications arepointed to' by means of a finger or pointer 45, which is. attached toone of the racks 1 1 in a position to move vertically across thesight-opening 33. When oil is dispensed in gallon quantities, I providea register to indicate the quantitiesindependently of the price-scale.This device consists of a dial 36, (see Fig. 2,) is mounted loosely on aboss- 37,-projecting from the superstructure or upper. framework. Thisdial 36 has suitable figures, i,ndia

eating the gallons in the present instance, and it may indicatehalf-gallons. Extending through the boss 37, upon; the end-of' which thedial is located, as beforestated, is an arbor 40, on one end of whichisa pointer 39, adapted to move over, the face of sa1d dial. The otherend of this arbor has a star .wheel 41 rigidly attached thereto. (SeeFig. 7.) This star-wheel liesadj acent to the rear side of oneof theracks 11 and in position to be tripped in each direction of movement ofsaid rack. The trip ing.- 'de vices consist of upper and lower paw s 42and 43, which are adjustably connected to the rack by means of screws44, which passthrough slots in the bodies of said pawls. .These.

pawls are in different positions tqengage the star-wheel on oppositesides ineither an e per or lower movement of the'rack.

movement imparted tothe starawheel, and

the pointer 39 is one-tenth of a revolution .011

- each engagement of the pawls 42 andv 43. In

the present case, assuming that each ofg the cylinders was limited to ahalf-gallon lqapacity, the star-wheel 40 would necessarily be trippedten times in order to havethe poinpler 39 indicate five gallons onthedial 36. s may, however, be varied according, toT the capacity of thepump. It will limited movement after they engage 3: star-wheel, suchmovement bein derstood that neither wheel. As shown in- Fig. 7., the

lower pawl site ends of the rack.

. .Having described my in emi I,

1 In an oil-pump of the type' s peci e ede -stood that the pawls/12 and43have onlggha 12o apn x mately half an inch. Itwillthere one b ,e, n-.I

combination with twin cylinders and their pistons and piston-rods, racksconnected to said piston-rods, a pinion engaging said racks and drivingthe pistons in opposite directions, of means engaging said pinions andlocking the pump against operation said means comprising a socketarranged in a housing which incloses said pinion, a screw-plug withinsaid socket and engaging and disengaging said pinion, and meansinsertible in said socket and engaging said screw-plug to engage ordisengage the same from the pinion.

2. In anoil-pump of the type specified, a pair of pump-cylinders andtheir pistons and piston-rods, racks connected to said pistonrods, apinion engaging said racks, a housing partially surrounding said pinionand having an interior screw-threaded socket, a plug within said socketadapted to lock and unlock said pinion, means insertible in said 1socket to engage said plug to engage or disengage the same with or fromsaid pinion, a cylindrical casing having a sight-opening therein andmounted upon the superstruc ture, a cylindrical price-scale within saidcasing with means projecting therefrom on the exterior of the casing forsetting said pricescale to the desired point, and a pointer movable topositions to indicate the prices of quantities of oil dispensed.

3. In an oil-pump of the type specified, a pair of cylinders and theirpistons and piston-rods, racks connected to said piston-rods, apinionengagingsaid racks, means for locking said pinion against operation,said means consisting of a screw-plug, a socket receiving saidscrew-plug and-means insertible in said socket and engaging thescrew-plug. to engage or disengage the same with or from said. p mon, adischarge pipe through which either cylinder empties, and a nozzle onthe and of said discharge-pipe, said nozzle having a gravity-valvenormally closing the exitpassage throughsaid nozzle.

4. In anoil-pump of the type specified, a pair of measuring-cylindersand their pistons and piston-rods, racks connected to said pis-"ton-rods, a pinion engaging said racks, means for locking said pinionagainst operation, said means consisting of a housing partiallyinclosing said pinion and having an interior screw-threaded socket inalinement with the teeth on the pinion, a screw-plug concealed in saidsocket and engaging or disengaging said pinion, and a key insertible insaid socket to actuate the screw-plug and means for measuring thequantities of oil discharged from said cylinders.

5. In an oil-pump of the type specified, a pair of measuring-cylindersand their pistons and piston-rods, racks connected to said piston-rods,a pinion engaging said racks, means for locking said pinion to preventan operation thereof, said means consisting of a housing having aninterior-screw-threaded socket in alinement with the teeth of saidpinion, a screw-plug concealed in said housing and engaging ordisengaging the pinion, and means insertible in said socket for engagingthe screw-plug, a numerical dial bearing indications denoting thequantities of oil discharged from said cylinders, a pointer to indicatethe numerals on said dial, and means operated through the movement ofone of the racks for rotating said pointer over the face of the dial.

In testimony whereofI aflix my signature in presence of two witnesses. I7 JOHN B. DAVIS.

Witnesses: a R. J. MoOARTY, CAROLYN M. THEOBALD.

